2016 Case Counts in the US

2019 | 20182017  |  2016  |  2015


See Also

Final data reported to ArboNET
In 2016, Zika virus disease became a nationally notifiable condition. Cases are reported to CDC by state, territorial, and local health departments using standard case definitions. These are final 2016 data reported to ArboNET for Zika virus disease.

US States

  • 5,168 symptomatic Zika virus disease cases reported
    • 4,897 cases in travelers returning from affected areas
    • 224 cases acquired through presumed local mosquito-borne transmission in Florida (N=218) and Texas (N=6)
    • 47 cases acquired through other routes, including sexual transmission (N=45), laboratory transmission (N=1), and person-to-person through an unknown route (N=1)

US Territories

  • 36,512 symptomatic Zika virus disease cases reported
    • 145 cases in travelers returning from affected areas
    • 36,367 cases acquired through presumed local mosquito-borne transmission
    • 0 cases acquired through other routes

Footnotes

Excludes congenital disease cases.

Sexually transmitted cases are not reported for US territories because with local transmission of Zika virus it is not possible to determine whether infection occurred due to mosquito-borne or sexual transmission.

See Also

Cases by State and Territory

ARBONET Zika Travel Local Cases Map 2016

Laboratory-confirmed symptomatic Zika virus disease cases and presumptive viremic blood donors reported to ArboNET by states and territories— United States, 2016
Laboratory-confirmed symptomatic Zika virus disease cases and presumptive viremic blood donors reported to ArboNET by states and territories— United States, 2016
Symptomatic disease cases*(N=5,168) Presumptive viremic blood donors†(N=38)
States No. (%) No. (%)
Alabama 37 (1) 1 (3)
Arizona 54 (1) 1 (3)
Arkansas 13 (<1) 0 (0)
California 421 (8) 4 (11)
Colorado 55 (1) 0 (0)
Connecticut 118 (2) 0 (0)
Delaware 17 (<1) 0 (0)
District of Columbia 41 (1) 0 (0)
Florida‡ 1,107 (21) 23 (61)
Georgia 107 (2) 0 (0)
Hawaii 11 (<1) 0 (0)
Idaho 5 (<1) 0 (0)
Illinois 105 (2) 0 (0)
Indiana 49 (1) 0 (0)
Iowa 26 (1) 1 (3)
Kansas 20 (<1) 0 (0)
Kentucky 31 (1) 0 (0)
Louisiana 38 (1) 0 (0)
Maine 12 (<1) 0 (0)
Maryland 130 (3) 0 (0)
Massachusetts 119 (2) 1 (3)
Michigan 67 (1) 0 (0)
Minnesota 66 (1) 0 (0)
Mississippi 23 (<1) 0 (0)
Missouri 37 (1) 0 (0)
Montana 9 (<1) 0 (0)
Nebraska 13 (<1) 0 (0)
Nevada 22 (<1) 1 (3)
New Hampshire 11 (<1) 0 (0)
New Jersey 180 (3) 0 (0)
New Mexico 10 (<1) 0 (0)
New York 1,002 (19) 2 (5)
North Carolina 100 (2) 0 (0)
North Dakota 3 (<1) 0 (0)
Ohio 83 (2) 0 (0)
Oklahoma 29 (1) 0 (0)
Oregon 47 (1) 0 (0)
Pennsylvania 175 (3) 0 (0)
Rhode Island 55 (1) 0 (0)
South Carolina 61 (1) 0 (0)
South Dakota 3 (<1) 0 (0)
Tennessee 61 (1) 0 (0)
Texas‡ 312 (6) 4 (11)
Utah 21 (<1) 0 (0)
Vermont 11 (<1) 0 (0)
Virginia 108 (2) 0 (0)
Washington 69 (1) 0 (0)
West Virginia 11 (<1) 0 (0)
Wisconsin 60 (1) 0 (0)
Wyoming 3 (<1) 0 (0)
  Symptomatic disease cases*                      (N=36,512) Presumptive viremic blood donors                     (N=325)
Territories No. (%) No. (%)
American Samoa 131 (<1) 0 (0)
Puerto Rico 35,395 (97) 325 (100)
U.S. Virgin Islands 986 (3) 0 (0)

Footnotes

*Includes reported confirmed and probable Zika virus disease cases per the CSTE case definitions.

† Presumptive viremic blood donors are people who reported no symptoms at the time of donating blood, but whose blood tested positive when screened for the presence of Zika virus RNA by the blood collection agency. Some presumptive viremic blood donors develop symptoms after their donation or may have had symptoms in the past. These individuals may be reported as both Zika virus disease cases and presumptive viremic blood donors.

‡Includes 218 cases in Florida and 6 cases in Texas that were acquired through presumed local mosquito-borne transmission.